Elemental Hero Prisma

{1}{w}: Send 1 Elemental Warrior with converted mana cost 2 from your library to
the graveyard. Elemental Hero Prisma gains
the sent cards colour. Activate this ability
only once each turn.
When Elemental Hero Prisma is sent to the graveyard, add to your hand the card sent to
the graveyard by Elemental Hero Prisma's effect this turn.